Stihl Trimmer Gear Head Replacement for FS160 FS180 FS220 FS290 FS300 FS350 FS380 FS310 FS400 FS450 FS480 28mm Drive Tube 6.3 Spline Replaces OEM 4128 640 0101 4128 640 0125 Fits Multiple Models and Drives

Trimmer Gear Head Replacement for FS Series, 28mm Drive Tube
✔️ 28mm drive tube, 6.3 spline, M12x1.5 LH, fits FS160-FS480

This gear head replacement is designed for string trimmers in the FS family, replacing OEM parts to restore drive accuracy and performance for home and professional use.

✅ Replaces OEM numbers 4128-640-0101, 4128-640-0102, 4128-640-0125
✅ Drive Tube dia: 28mm, spline: 6.3mm square, Collar Nut: M12x1.5 Left-Hand Thread
✅ Fits FS160/FS180/FS220/FS290/FS300/FS310/FS350/FS400/FS450/FS480
✅ Includes: 1x Bevel Gear Head, 2x Spare mounting screws, 1x Nut, 1x Tool
✅ Not compatible with Gear Head 4119 640 0107

💡 What is a gear head replacement for a Stihl trimmer and how does it work across FS models?

This handy guide explains compatibility and fitment across FS models. - Cross-model compatibility across FS160-FS480 - Key specs: 28mm drive tube, 6.3 spline, left-hand M12x1.5 thread - Quick fit checks before purchase ✝️